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Post #1971
7.05K
- 🤣 24
- 👍 20
- ❤ 6
Channel Public Channel
JA JavaScript
@javascript
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Showing posts older than #1972 · Back to latest
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Post #1970
6.71K
CHALLENGE
function displayArguments() {
console.log(arguments.length);
console.log(arguments[0]);
console.log(arguments[2]);
}
displayArguments('Hello', 'World', 'JavaScript', 'Quiz');- 🤔 8
- 🤣 7
- ❤ 3
- 👍 3
- 🔥 2
Post #1969
7.37K
📄 Play Tetris in a PDF File
I'll let you decide if this one is fun or frightening! Whether or not this will work depends on your PDF reader or browser support, but it works with Chrome and Firefox, at least.
The PDF document format supports embedded JavaScript and this experiment uses it to implement a game of Tetris. The developer, Thomas Rinsma, has used Python to output the PostScript that includes the game's JavaScript. Couple that with the fact many browser PDF renderers are themselves implemented in JavaScript (e.g. PDF.js) and you have a veritable Matryoshka doll of technologies at play here.
I'll let you decide if this one is fun or frightening! Whether or not this will work depends on your PDF reader or browser support, but it works with Chrome and Firefox, at least.
The PDF document format supports embedded JavaScript and this experiment uses it to implement a game of Tetris. The developer, Thomas Rinsma, has used Python to output the PostScript that includes the game's JavaScript. Couple that with the fact many browser PDF renderers are themselves implemented in JavaScript (e.g. PDF.js) and you have a veritable Matryoshka doll of technologies at play here.
- 🤣 11
- 👍 6
- ❤ 2
- 🤔 2
Post #1968
6.08K
- 👍 27
- 🤣 16
- 🤔 5
- ❤ 4
- 🔥 1
Post #1967
6.55K
CHALLENGE
function trickyFunction() {
let a = 5;
let b = '5';
let c = 5;
if (a == b && b === c) {
console.log('Condition 1');
} else if (a === c || b == c) {
console.log('Condition 2');
} else {
console.log('Condition 3');
}
}
trickyFunction();- 👍 6
- 🔥 2
Post #1966
6.72K
👀 PostalMime: A Universal Email Parsing Library
An email parsing library happy in most JS runtimes. Takes the raw source of emails and parses them into their constituent parts.
Postal Systems
An email parsing library happy in most JS runtimes. Takes the raw source of emails and parses them into their constituent parts.
Postal Systems
- 👍 7
- ❤ 2
- 🔥 1
Post #1965
6.65K
- 🤣 23
- 👍 7
- 🤔 7
- ❤ 4
- 🔥 2
Post #1964
6.64K
CHALLENGE
var obj = { a: 10, b: 20 };
with (obj) {
var result = a + b;
}
console.log(result);- 👍 4
- ❤ 1
Post #1963
7.31K
⭐ 2024's JavaScript Rising Stars
It’s time to fully wave goodbye to 2024, but not before Michael Rambeau’s annual analysis of which JavaScript projects fared best on GitHub over the past year. Even if you dislike GitHub stars as a metric for anything, this remains a great way to get a feel for the JavaScript ecosystem and see what libraries and tools have mindshare in a variety of niches. A fantastic roundup as always.
Michael Rambeau
It’s time to fully wave goodbye to 2024, but not before Michael Rambeau’s annual analysis of which JavaScript projects fared best on GitHub over the past year. Even if you dislike GitHub stars as a metric for anything, this remains a great way to get a feel for the JavaScript ecosystem and see what libraries and tools have mindshare in a variety of niches. A fantastic roundup as always.
Michael Rambeau
- 👍 10
- ❤ 2
- 🔥 2
Post #1962
6.38K
- ❤ 12
- 🤣 10
Post #1961
6.79K
CHALLENGE
const myObject = {
a: 1,
b: 2,
c: 3,
[Symbol.iterator]: function* () {
for (let key of Object.keys(this)) {
yield this[key];
}
}
};
const iter = myObject[Symbol.iterator]();
console.log(iter.next().value);
console.log(iter.next().value);
console.log(iter.next().value);- ❤ 3
- 👍 3
- 🤩 1
Post #1960
7.19K
- 👍 14
- 🤣 14
- ❤ 8
Post #1959
6.98K
CHALLENGE
function* customGenerator() {
yield 'Hello';
yield 'World';
return 'Done';
}
const gen = customGenerator();
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);- 👍 7
- ❤ 1
Post #1958
7.33K
- 🤔 29
- 🤣 23
- 👍 15
- ❤ 10
- 🤩 1
Post #1957
7.35K
CHALLENGE
const mySet = new Set();
mySet.add(10);
mySet.add(20);
mySet.add(10);
mySet.add(30);
console.log(mySet.size);
- 👍 13
Post #1956
7.75K
- ❤ 7
- 👍 6
- 🔥 4
Post #1955
7.56K
CHALLENGE
const WM = new WeakMap();
let obj = {};
let anotherObj = {};
WM.set(obj, 'object data');
WM.set(anotherObj, 'another object data');
obj = null;
// Let's check what's logged
console.log(WM.has(obj));
console.log(WM.has(anotherObj));
- 👍 9
- ❤ 1
Post #1954
7.92K
😢
- 🤣 75
- 🤔 13
- 🤩 2
Post #1953
7.02K
- 🤔 16
- 👍 14
- 🤣 11
- ❤ 2
- 🔥 2
Post #1952
7.33K
CHALLENGE
async function fetchData() {
let data = 'initial';
const promise = new Promise((resolve) => {
setTimeout(() => {
resolve('fetched');
}, 1000);
});
promise.then((result) => {
data = result;
});
return data;
}
fetchData().then(console.log);- 👍 13
- ❤ 3